diff --git a/test/runtimes/runner/lib/lib.go b/test/runtimes/runner/lib/lib.go
index 64e6e14db..2f1083baf 100644
--- a/test/runtimes/runner/lib/lib.go
+++ b/test/runtimes/runner/lib/lib.go
@@ -122,6 +122,10 @@ func getTests(ctx context.Context, d *dockerutil.Container, lang, image string,
 			}
 			tcs = append(tcs, tests[tc])
 		}
+		if len(tcs) == 0 {
+			// No tests to add to this batch.
+			continue
+		}
 		itests = append(itests, testing.InternalTest{
 			Name: strings.Join(tcs, ", "),
 			F: func(t *testing.T) {